I've felt for awhile that the dragon book needs a dragon search feature, not just a sort/filter option. Many times I am looking for a certain dragon and I don't know what island it is on and I have to go through a tedious one by one search. Often I won't know the actual element or rarity factors to filter with so that is no help. So much more efficient to do an individual dragon search (like flame or terra or neon or whatever)
Also, I wish we could buy gems or food with gold.